Heian Maru

Info

544 平安丸 (へいあんまる) Heian Maru Kai Hikawa Maru Class Submarine Tender HP 36→41 FP 5→23 ARM 3→18 TORP 0 EVA 14→27 AA 10→28 PLA 0 ASW 0 SPD Slow LOS 11→30 RGE Medium LUK 6→44

Aircraft Equipment 0 12cm Single High-angle Gun Mount 0 -Unequipped- -Locked- -Locked- Modernization 1 0 1 1 Build Time 2:30 (Unbuildable) Remodel Req Consumption 30 10 Dismantle 2 1 12 1 Illustrator Akasaka Yuzu Seiyuu Yuikawa Asaki

549 平安丸改 (へいあんまるかい) Heian Maru Kai Kai Hikawa Maru Class Submarine Tender HP 39→44 FP 11→42 ARM 17→34 TORP 0 EVA 16→37 AA 12→32 PLA 3 ASW 0 SPD Slow LOS 18→39 RGE Medium LUK 11→57

Aircraft Equipment 1 12cm Single High-angle Gun Mount 1 25mm Twin Autocannon Mount 1 25mm Single Autocannon Mount -Locked- Modernization 1 0 1 1 Remodel Level 25 Remodel Req 480 500 Consumption 30 10 Dismantle 2 1 13 1 Illustrator Akasaka Yuzu Seiyuu Yuikawa Asaki

Gameplay Notes

Submarine Tenders (AS) are very weak, mostly used for certain Routings

• They can perform a powerful but limited special attack with SS(V).

Special Mechanics

Submarine Touch

She can trigger a Special Attack involving a Submarine Tender leading a fleet of at least two submarines.

• The flagship must be a Submarine Tender (AS) at Lv 30+,
  • She must not be more than ChuuhaModerately Damaged (中破).
• The 2nd and 3rd ships must be Submarines (SS) or Aircraft Carrying Submarines (SSV) and not evacuated via SFFCF,
  • The 4th ship may optionally be a SS(V), but does not affect the above requirement,
  • At least two SS(V) among the 2nd, 3rd, and 4th ships must not be more than Shouha Lightly Damaged (小破) ,
  • If all 3 ships are SS(V), the 2nd and 4th ones will attack; if one of the two is ChuuhaModerately Damaged (中破), the 3rd one will attack instead.
• The fleet must be a single fleet or a Striking Force Fleet,
• The formation needs to be either Echelon or Line Abreast,
• At least one Submarine Supply Material must be available in the inventory.

• Two SS(V) will launch torpedo strikes.
• The attack power of each strike is postcapped and unaffected by formation, engagement, or damage cap.
• A rough damage formula per Submarine attack is:

[math]\displaystyle{ \text{DMG}_\text{day} = \text{TP} \times ( 1.2 + 0.04 \times \sqrt{LV} ) }[/math] [math]\displaystyle{ \text{DMG}_\text{night} = ( \text{FP + TP} ) \times ( 1.2 + 0.04 \times \sqrt{LV} ) }[/math]

With

• [math]\displaystyle{ \text{DMG} }[/math] the damage result for day and night battle respectively,
• [math]\displaystyle{ \text{FP} }[/math] the submarine's Firepower stat,
• [math]\displaystyle{ \text{TP} }[/math] the submarine's Torpedo stat,
• [math]\displaystyle{ \text{LV} }[/math] the submarine's Level.
  • [math]\displaystyle{ 1.2 + 0.04 \times \sqrt{LV} = 1.6 }[/math] at Lv 100.

The number of attacks per Touch ranges from 2 to 4.

• Each submarine will trough either 1 or 2 torpedo strikes.
  • Only Lv 75+ submarines can trigger 2 strikes,
  • If a Lv 75+ submarine does not carry any Submarine Radar, it rolls between 1 and 2 strikes randomly (exact rate unclear yet),
  • If a Lv 75+ submarine does carry any Submarine Radar, it is guaranteed to roll 2 strikes.

One Submarine Supply Material will be consumed for EACH battle the Touch triggers in.

• If the Touch triggers twice in a battle, only a single will be consumed for this battle.
• If the Touch triggers in multiple nodes, one will be consumed for each node it is triggered.

It does not consume any extra ammo. If the game is refreshed before the battle ends, then no material will be consumed even if the touch triggered.

Trigger rate is affected by the Level and luck stat of the participating ships.

• Submarine Radars affect the trigger rate, each increasing the trigger rate by about 10 %.

It has a chance to trigger every time the AS takes a turn at shelling.

• It can trigger in both day and night for the same battle.
• It can only trigger once during day battle.
• If it fails to trigger during the day battle, there is still a chance to trigger it in the follow-up night battle.
• If all enemies sunk, then touch stops early.

The attack order is always (where among the attacking submarines, 1 is upper one and 2 is lower one):

• 1-1-2-2 for 4 attacks,
• 1-1-2 or 1-2-2 for 3 attacks,
• 1-2 for 2 attacks.
  • If touch stops early, then attacks can be just 1-1
  • Also note that the actual order may be different from client animation of who shoots torpedoes, which always assigns attackers alternately like 1-2-1-2 or 1-2-1 or 1-2, so you may mismatch the real attack.

The touch can be activated multiple times per sortie.

When attacking a fleet, the usual Targeting rules apply.

• The torpedoes fired target ships independently,
• When facing a Combined Fleet, if any ship is present in the escort fleet on day battle, then all torpedoes will be fired to the escort fleet.

Regular
Taigei Special Attack Taigei Special Attack Damaged Jingei Special Attack Jingei Special Attack Damaged Jingei Special Attack Kai Jingei Special Attack Kai Damaged Chougei Special Attack Chougei Special Attack Damaged Chougei Special Attack Kai Chougei Special Attack Kai Damaged Heian Maru Special Attack Heian Maru Special Attack Damaged Heian Maru Special Attack Kai Heian Maru Special Attack Kai Damaged
Seasonal
Taigei Summer 2021 Special Attack Taigei Summer 2021 Special Attack Damaged Jingei Summer 2021 Special Attack Jingei Summer 2021 Special Attack Damaged Chougei Summer 2022 Special Attack Chougei Summer 2022 Special Attack Damaged Heian Maru Summer 2024 Heian Maru Summer 2024 Damaged Heian Maru Kai Summer 2024 Heian Maru Kai Summer 2024 Damaged Special Attack Summer bis 2024 Special Attack Summer bis 2024 Damaged Special Attack Kai Summer bis 2024 Special Attack Kai Summer bis 2024 Damaged

Equipability Exceptions

AS	Default equipment compatibility
	✔️ Can Equip	❌ Cannot Equip
	Recon	Sp Bomber
	Large Small	Sp Sp_Sec Sub Minisub Small Large Sp
	Medium	Large Small Large
	RE: Medium
	Notes: = ; = ; = ; = ; =Recon ; =Bomber ; Small= ; Medium= ; Sec= ; =

Heian Maru Equipability Exceptions
	Heian Maru/Kai
Ship Exceptions	Cannot Equip:

Fit Bonuses

[edit]Heian Maru Equipment Bonuses
Equipment	Extra Requirement									Note
Ship-Type Bonuses
12.7cm Twin Gun Mount Model C Kai 3 H	+ Air Radar			+2					+2	One-time
	(2nd equipped) + Air Radar			+2						One-time
	(3rd equipped) + Air Radar			+2						One-time
12cm Single High-angle Gun Mount Model E Kai	(★2-3)			+1
	(★4-5)			+1					+2
	(★6-7)	+1		+1					+2
	(★8-9)	+1		+2					+2
	(★MAX)	+1		+2				+1	+2
12cm Single High-angle Gun Mount + 25mm Machine Guns Additions	(★0)	+1		+2				+1	+2
	(★1)	+1		+2				+1	+3
	(★2-3)	+1		+2				+1	+4
	(★4-5)	+1		+3				+1	+4
	(★6)	+1		+3				+1	+5
	(★7)	+1		+3				+2	+5
	(★8)	+1		+4				+2	+5
	(★9)	+1		+4				+2	+6
	(★MAX)	+2		+4				+2	+6
	+ Air Radar			+2					+2	One-time
Passive Radiolocator (E27) + Type 22 Surface Radar Kai 4 (Calibrated Late Model)	(1st equipped) (★7)							+1		One-time
	(1st equipped) (★8)							+1	+1	One-time
	(1st equipped) (★9)	+1						+1	+1	One-time
	(1st equipped) (★MAX)	+1						+2	+1	One-time
	+ ★3+ 12.7cm Twin Gun Mount Model D Kai 2 OR ★3+ 12.7cm Twin Gun Mount Model D Kai 3	+1						+1		One-time
	+ ★3+ 12.7cm Twin Gun Mount Model D Kai 2 OR ★3+ 12.7cm Twin Gun Mount Model D Kai 3 + ★4+ Type 13 Air Radar Kai (Late Model)	+1		+4				+1	+3	One-time
2cm Flakvierling 38	(★4-6)			+1					+1
	(★7-9)	+1		+2					+1
	(★MAX)	+1		+3					+2
	(★4-MAX) + Air Radar			+1						One-time
3.7cm FlaK M42	(★6-7)			+1					+1
	(★8-9)	+1		+1					+1
	(★MAX)	+1		+1				+1	+2
	(★6-MAX) + Air Radar			+2						One-time
Arctic Camouflage (+ Arctic Equipment)	(★7)								+1
	(★8)							+1	+1
	(★9)	+1						+1	+1
	(★MAX)	+1						+1	+2
Fleet Communication Antenna	(★4)							+1
	(★5)	+1						+1
	(★6)	+1						+1	+1
	(★7)	+1						+2	+1
	(★8)	+2						+2	+1
	(★9)	+2						+2	+2
	(★MAX)	+2						+3	+2
Type 0 Passive Sonar	(1st equipped) (★3-4)								+1	One-time
	(1st equipped) (★5-6)				+1				+1	One-time
	(1st equipped) (★7)				+1				+2	One-time
	(1st equipped) (★8)				+2				+2	One-time
	(1st equipped) (★9)				+2			+1	+2	One-time
	(1st equipped) (★MAX)				+3			+1	+2	One-time
Kyoufuu Kai 2 OR Kyoufuu Kai 2 (Skilled)	(★3-4)	+1
	(★5-6)	+1		+1
	(★7-9)	+1		+1					+1
	(★MAX)	+1		+1				+1	+1

Drop Locations

Ship	Rarity	Type	No.	World 1						World 2					World 3					World 7					World 4					World 5					World 6					Remarks
				1	2	3	4	5	6	1	2	3	4	5	1	2	3	4	5	1	2	3	4	5	1	2	3	4	5	1	2	3	4	5	1	2	3	4	5
Heian Maru	Rare	AS	544																																					Unbuildable

CG

Regular
Base Base Damaged Kai Kai Damaged Special Attack Special Attack Damaged Special Attack Kai Special Attack Kai Damaged

Trivia

General Information

• She was named in honor of Kyoto's historic Heian Shrine.
• She was launched on the 16th of April 1930 as an ocean liner,
• She was converted as a submarine tender between 1941 and 1942.
• She was sunk by US aircraft on the 18th of February 1944

Update History

• She was added on the 1st of March 2024 as Early Spring 2024 Event E2 drop.

Misc

• Her sister Hikawa Maru still exists today as a museum ship.
• She was involved with the future I-41 Captain, LCDR Itakura Mitsumi, in an accident involving alcohol.

See Also

• Wikipedia entry on Heian Maru